Sumatoria

public int sumatoria(int m, int n) {
  int suma = 0,mayor,menor;
  if (m > n){
    mayor = m;
    menor = n;
  }
  else{
    mayor = n;
    menor = m;
  }
  while (menor <= mayor){
    suma += mayor;
    mayor--;
  }
  return suma;
}